The United Nations - Words and Definitions

Match the words with the definitions. There are more words than you will need.
nature and the world and around us
guns, bombs, knives and other objects you use to fight
person who must leave their country because of a war or natural disaster
the situation of being poor
when two or more countries promise to do something
the main offices of an organisation
to say no to a decision
person in a high position
place or city where an organisation always meets
to march into another country with an army